For the record, this was not one of my patented jack moves. This was a considered action from a player perspective. Urik is hurt, real bad. Ironarm is the one who did it. If he could have, Urik would have dragged Ironarm onto the ship with them, but he got chased away.
Hate/Compassion is Urik's Morality. Right now, the narrative has presented a target of hate, but not much in the way of targets for compassion. Urik is enraged; he was almost killed by this guy! And from his perspective, he has no idea why! He doesn't really know much about the Empire and certainly doesn't know about the Jedi purges or Order 66. All he knows is that these troopers in white suits, and this one-armed trooper in particular, tried to kill him. The chopping of an arm was a move of frustration and a symbolic move mirroring Ironarm's cybernetic limb.
In short, this was not a reasonable action on Urik's part. Not at all. But from my perspective as a player, it was a reasoned action that I made because it fit the character and narrative, with full knowledge and expectation of consequences. Not just to cause chaos. This was not a "random" act.